<?xml version="1.0" encoding="utf-8"?>
<!--
Taxonomy based on XBRL standard Version 2.1.
Created by UBmatrix Automator Professional Edition 6.402.2151.20901 (2005-11-21 12:36).  
Contact www.ubmatrix.com
Software Copyright (c) 2002-2005 Universal Business Matrix inc., All Rights Reserved
Produced on 2005-11-21 16:20:26
-->
<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:tx="http://www.xbrl.org/dim/conf/389/contextForbiddenExplicitDimInScenario" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" targetNamespace="http://www.xbrl.org/dim/conf/389/contextForbiddenExplicitDimInScenario" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:roleType roleURI="http://www.example.com/link/role/allCube" id="allCube">
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.example.com/link/role/exclusionCube" id="exclusionCube">
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="contextForbiddenExplicitDimInScenario-definition.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="contextForbiddenExplicitDimInScenario-label.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Label Links, all" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://www.xbrl.org/dim/conf/product" schemaLocation="../../lib/base/products.xsd" />
  <import namespace="http://www.xbrl.org/dim/conf/region" schemaLocation="../../lib/base/regions.xsd" />
  <import namespace="http://www.xbrl.org/dim/conf/primary" schemaLocation="../../lib/base/primary.xsd" />
  <element id="tx_hc_AllCube" name="hc_AllCube" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="tx_hc_ExcludeSome" name="hc_ExcludeSome" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="tx_ProductDim" name="ProductDim" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="tx_RegionDim" name="RegionDim" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="instant" abstract="true" nillable="true" />
</schema>